DE102013203771A1 - Linear rolling bearing with glued Wälzflächenteil - Google Patents

Abstract

The invention relates to a linear roller bearing (10) with a guide rail (12) extending in a longitudinal direction (11) and a guide carriage (30), the guide carriage (30) comprising a main body (32) and at least one rolling surface part (50) with a flat one comprises a first rolling surface (51), the first rolling surface (51) being assigned a plurality of rollers (20) arranged in a row, which are in rolling contact with the first rolling surface (51) and a second rolling surface (13) on the guide rail (12) , wherein the rolling surface part (50) opposite to the first rolling surface (51) has a flat first bearing surface (52). According to the invention, a plurality of separate plastic spacers (60) are provided between the first contact surface (52) and the main body (32), which are fixed to the first contact surface (52) and / or fixed to the main body (32) using a first adhesive (63) ), the spacers (60) being surrounded by a second (64) adhesive different from the first (63), which directly connects the first bearing surface (52) to the main body (32), the material of the spacers (60 ) is selected differently from the first and from the second adhesive (63; 64).

Description

The invention relates to a linear roller bearing according to the preamble of claim 1.

From the DE 10 2008 051 682 A1 is known a linear roller bearing. The linear rolling bearing comprises a guide rail extending in a longitudinal direction with a constant cross-sectional shape. The guide rail has four flat second rolling surfaces, which are each arranged at 90 ° inclined to each other. Next, a carriage is provided, which surrounds the guide rail U-shaped. In the guide carriage a total of four separate Wälzflächenteile are installed, each having a flat first rolling surface, which are parallel to an associated second rolling surface on the guide rail. Between the first and the second rolling surface, a plurality of rollers are respectively installed, which are in rolling contact with the first and the second rolling surface. Accordingly, the rollers roll on the first and the second rolling surface when the carriage is moved relative to the guide rail in the longitudinal direction.

Parallel to the first rolling surface, a flat first bearing surface is provided on the Wälzflächenteil. Between the support surface and a main body of the guide carriage, a metal sheet is arranged, which has a plurality of recesses which are filled with an adhesive. The adhesive causes the Wälzflächenteil is held firmly on the main body, wherein the rigid metal sheet transmits the forces acting in the carriage, so that the carriage has a high rigidity.

It has been shown that the adhesion of the known carriage breaks during prolonged operation of the linear roller bearing. At the same time it has been shown that one can dispense with the stiffness-increasing effect of the metal sheet, if only the adhesive layer is formed sufficiently thin. A corresponding linear roller bearing is from the DE 10 2008 019 002 A1 known. This results in the problem of setting the thickness of the adhesive layer exactly.

The object of the invention is to provide a linear roller bearing with a glued Wälzflächenteil whose adhesive layer is made very thin, wherein the required for a secure bonding minimum thickness of the adhesive layer over the entire support surface is ensured away. Disturbances of the bond, which could be the starting point for a break of the adhesive layer during operation of the linear roller bearing, should be avoided. Furthermore, the area of the supporting adhesive layer should be maximized so that the bond has a high strength. In addition, the linear roller bearing should be inexpensive to produce. Furthermore, as few devices as possible should be required for guide carriages of different lengths.

According to the independent claim we achieved this object in that between the support surface and the main body a plurality of separate plastic spacers are provided which are connected via a first adhesive fixed to the support surface and / or fixed to the main body, wherein the spacers of a second surrounded by the first different adhesive, which connects the support surface directly fixed to the main body, wherein the material of the spacer is selected differently from the first and the second adhesive. The separate spacers can be prepared in advance with a certain uniform thickness and coated with the first adhesive. In this case, it is preferably intended to produce the spacers from a self-adhesive film, as it is offered in the market in a wide range. The spacers are preferably glued to the first bearing surface on Wälzflächenteil with the first adhesive. Subsequently, the first bearing surface of the Wälzflächenteils and / or a second bearing surface of the main body is coated with the second adhesive. Thereafter, the Wälzflächenteil is pressed onto the second bearing surface on the main body. As a result, the still liquid second adhesive spreads between the first and second support surfaces and between the spacers so as to completely surround the spacers. The thickness of the second adhesive layer results from the thickness of the spacers and the layer thickness of the first adhesive, which can each be prepared very precisely in advance. Since the spacers are made of plastic, they are not wetted by the second adhesive, so that the second adhesive can not penetrate into the gap between the spacer and the first and the second bearing surface, especially where no first adhesive is present. Should accidentally still glue get into this area, it will be completely displaced when pressing the Wälzflächenteils. Preferably, the first adhesive is only between the spacer and the first support surface.

In the dependent claims advantageous refinements and improvements of the invention are given.

The spacers may have a first planar surface which faces the first bearing surface, wherein a second surface parallel to the first surface is provided, which faces the main body. Such spacers can be inexpensively cut out of a plastic film. The first and the second Support surface are best adapted to the spacers with their easy-to-produce flat shape.

The distance between the first and the second surface may be between 5 μm and 50 μm. This results in a layer thickness of the second adhesive, which is just so great that a secure bond is ensured. At the same time, the thin second adhesive layer has a high rigidity.

The outline of the first and the second surface may be the same. Such a spacer is particularly easy to produce, for example by punching.

The outline of the first and the second surface may be circular. This shape minimizes the risk of cracks forming in the second adhesive at the transition between the spacer and the second adhesive, ultimately leading to the breakage of the second adhesive.

The diameter of the first and second surfaces may be between 20% and 90% of the width of the rolls. In the case of such large spacers, very few, preferably two, spacers are sufficient to place the rolling surface parts with a low risk of tipping on the second bearing surface on the main body. In particular, tilting about an axis parallel to the longitudinal direction is critical. It should be noted that the rollers preferably have a circular cylindrical peripheral surface and two opposite planar third end surfaces, which are aligned perpendicular to the central axis of the peripheral surface. The width of the rollers is accordingly the distance between the two third end faces.

The spacer can be made of polyester. This plastic is only very poorly wetted by a thermosetting adhesive. For this, this material would have to undergo a complex plasma surface treatment. The preferably used untreated polyester material thus prevents the second adhesive from penetrating into the gap between the second bearing surface and the spacer, which would result in an increase in the layer thickness of the second adhesive. Furthermore, polyester has a high temperature resistance, so that the second adhesive can cure at high temperatures and thus quickly.

It can be provided exactly two spacers whose clear distance in the longitudinal direction between 50% and 80% of the length of Wälzflächenteils. As a result, the manufacturing costs of the linear roller bearing are minimized, wherein the Wälzflächenteil is still sufficiently secured against tilting relative to the main body.

The first adhesive may be a pressure-sensitive adhesive, preferably an acrylate, wherein the second adhesive is a thermoset, preferably an epoxy resin. The pressure-sensitive adhesive can be applied in advance in a simple manner to the spacers, which are preferably produced starting from a plastic film. The thermoset second adhesive provides a very strong bond between Wälzflächenteil and main body. The preferred adhesives work particularly well, with the liquid epoxy resin in particular causing no dissolution of the acrylate.

• – Bereitstellen einer Kunststofffolie, welche auf einer ersten Seite, welche der ersten Oberfläche des Abstandshalters entspricht, mit einem Haftkleber als erstem Klebstoff beschichtet ist; und
• – Ausstanzen der Abstandhalter aus der Kunststofffolie, wobei der Abstandhalter zeitgleich mit der ersten Seite auf die erste Auflagefläche des Wälzflächenteils gedrückt wird.

The Wälzflächenteile with the spacers can be prepared in advance particularly cost-effective and standard with a method comprising the following steps:

• - Providing a plastic film which is coated on a first side, which corresponds to the first surface of the spacer, with a pressure-sensitive adhesive as a first adhesive; and
• - Punching the spacers from the plastic film, wherein the spacer is pressed simultaneously with the first side on the first bearing surface of Wälzflächenteils.

The invention will be explained in more detail below with reference to the accompanying drawings. It shows:

1 a perspective view of a linear roller bearing according to the invention;

2 a cross section of the linear roller bearing after 1 ;

3 a rough schematic longitudinal section of a linear roller bearing according to the invention;

4 a plan view of a Wälzflächenteils with spacers from the main body side facing;

5 a rough schematic side view of an apparatus for producing the Wälzflächenteile with the spacers; and

6 a rough schematic front view of the device according to 5 , where the viewing direction is marked accordingly there.

1 shows a perspective view of a linear roller bearing according to the invention 10 , The linear rolling bearing 10 includes a guide rail 12 , which has a constant cross-sectional shape in a longitudinal direction 11 extends. At the guide rail 12 For example, there are four second rolling surfaces 13 provided, each adjacent second rolling surfaces 13 are arranged inclined by 90 ° to each other. At the bottom of the guide rail 12 is a flat mounting surface 14 provided with the guide rail 12 can be attached to a (not shown) subassembly. The guide rail is made of steel and is at least in the area of the second rolling surfaces 13 hardened.

On the guide rail 12 is a carriage 30 longitudinal 11 movably supported, which surrounds the guide rail U-shaped. But it is also possible that the guide rail surrounds the carriage U-shaped. The carriage 30 includes a main body 32 made of unhardened steel, at its two second faces 34 in the longitudinal direction 11 each have a separate deflection assembly 31 is attached. In the deflection assembly 31 curved deflection channels are arranged for the rollers, which the rollers from the first rolling surface in the return pipe (no. 37 in 2 ) and vice versa. The deflection assemblies 31 are each with an end seal 39 provided, the sealing lip gap-free on the guide rail 12 is applied. At the of the guide rail 12 opposite top of the main body 32 is a mounting surface 35 provided, which preferably has three planar sections. About the attachment surface 35 and the local tapped holes 36 can the carriage 30 be attached to a (not shown) parent assembly.

2 shows a cross section of the linear roller bearing 10 to 1 , In the carriage 30 is for every second rolling surface 13 the guide rail 12 a Wälzflächenteil 50 with a first rolling surface 51 provided, which are parallel to the second Wälzfläche 13 is arranged. Between the first and the second rolling surface 51 ; 13 each are a plurality of rollers arranged in a row 20 built-in. All roles 20 are identical and have a circular cylindrical peripheral surface and two parallel third end surfaces 21 on, which are aligned perpendicular to the central axis of the peripheral surface. The peripheral surface of the rollers lies on the first and the second rolling surface 51 ; 13 , so that a rolling contact between the rollers 20 and the rolling surfaces 51 ; 13 consists. In the two U-thighs of the main body 32 is for every first rolling surface 51 a return pipe 37 made of plastic in an adapted bore of the main body 32 built-in. Via the deflection assemblies (No. 31 in 1 ) and the return pipes 37 can the roles 20 in the carriage 30 circulating endlessly.

Attention is also drawn to the four longitudinal seals 38 , with a constant cross-sectional shape in the longitudinal direction 38 extend. The longitudinal seals 38 are on the carriage 30 attached and lie with its sealing lip on the guide rail 12 at.

3 shows a rough schematic longitudinal section of a linear roller bearing according to the invention 10 , The Wälzflächenteil 50 extends with a constant, rectangular cross-sectional shape over the entire length of the main body 32 , The flat second faces 34 of the main body 32 are in alignment with the flat first faces 53 of Wälzflächenteils 50 arranged. But it can also be thought that the Wälzflächenteil 50 longitudinal 11 over the main body 32 protrudes to a bendable inlet area at Wälzflächenteil 50 to create, so the roles 30 run smoothly and with low impact. The same effect can be achieved by the Wälzflächenteil 50 in the inlet area not with the second adhesive 64 is relined, with an additional recess (no. 54 in 4 ) at Wälzflächenteil 50 may be provided to a sufficiently large bending path of Wälzflächenteils 50 to enable.

Between the first rolling surface 51 at Wälzflächenteil 50 and the second rolling surface 13 on the guide rail 12 are several rolls arranged in a row 20 fitted with their peripheral surface 22 on the first and the second rolling surface 51 ; 13 roll over, so that the carriage 30 opposite the guide rail 12 can move in the longitudinal direction. Here are the roles 20 preferably under bias, so that the linear roller bearing 10 has no game.

Parallel opposite to the first rolling surface 51 has the Wälzflächenteil 50 a first flat bearing surface 52 on. The first contact surface 52 there is a second contact surface 33 at the main body 32 parallel opposite. The distance between the first and the second support surface 52 ; 33 is equal to the layer thickness of the second adhesive 64 , This is preferably in a range between 20 microns and 100 microns and is designed to be as constant as possible. This results in a secure bond, wherein the steel compared to relatively elastic adhesive, the rigidity of the linear roller bearing 10 almost not affected. For adjusting the layer thickness of the second adhesive 64 or the distance between the first and the second support surface 52 ; 33 are two spacers 60 by means of a first adhesive 63 at the Wälzflächenteil 50 attached. The fat 66 of the spacer 60 is for example 20 microns, wherein the layer thickness of the first adhesive 63 for example, 30 microns. On the market self-adhesive plastic films are available, which just have the dimensions mentioned. The spacer 60 is accordingly formed by the carrier material of this plastic film, wherein the first adhesive 63 the pressure-sensitive adhesive is, with which the plastic film is coated. Due to the production of a plastic film, the spacers have 60 a first and a second planar surface 61 ; 62 which are aligned parallel to each other. The second surface 62 is preferably located directly on the second bearing surface 33 of the main body 32 on, where there is no first or second adhesive. The first surface 61 is preferably over the first adhesive 63 firmly with the Wälzflächenteil 50 connected.

The clear distance 65 between the two spacers is preferably between 50% and 80% of the length 55 of Wälzflächenteils 50 , For the first glue 63 it is preferably a pressure-sensitive adhesive in the form of an acrylate. For the second glue 64 it is preferably an epoxy resin. The second adhesive completely surrounds the circular spacers, as it compresses Wälzflächenteil 50 and main body 32 distributed accordingly.

4 shows a plan view of Wälzflächenteils 50 with spacers 60 from the side facing the main body. The Wälzflächenteil 50 is rectangular in plan view. At its two longitudinal ends in each case a recess 54 provided to an elastically bendable inlet region on Wälzflächenteil 50 to accomplish. The recesses 54 can optionally be omitted. The two spacers 60 are with some distance to the recesses 54 arranged. This distance is chosen so that the second glue the spacers 60 completely surrounds, at the same time as large a clear distance 65 the spacer 60 given is. When arranging the spacers 60 It should be noted that at the end of the adhesive layer high loads may occur in the second adhesive, so there is no weakening of the second adhesive by the spacers 60 should take place.

The Wälzflächenteil 50 preferably has two planes of symmetry 56 ; 57 with respect to which it is mirror-symmetrical. The first symmetry plane 56 runs parallel to the longitudinal direction 11 , wherein the second plane of symmetry 57 perpendicular to the longitudinal direction 11 is aligned.

5 shows a rough schematic side view of a device 70 for producing the Wälzflächenteile 50 with the spacers 60 , Several rolling surface parts 50 are in a row in a row in a row in the device 70 inserted so they with their first faces 53 collide. The hold down 77 with the punching tool 78 moves only perpendicular to the feed direction 79 , The rolling surface parts 50 are fed by a (not shown) feed device cyclically in the feed direction 79 emotional. Differently long Wälzflächenteile 50 can by appropriately adapted feed paths in one and the same device 70 are processed. During the punching process are the Wälzflächenteile 50 still, being the hold-down 77 and the punching tool 78 just above the location of the rolling surface part 50 located where the spacer is to be placed. In 5 are the holes 81 in the plastic film 75 to recognize that remain after punching the spacers.

6 shows a rough schematic front view of the device 70 to 5 , where the viewing direction is marked accordingly there. The device 70 includes a first, a second and a third rotatable roller 71 ; 72 ; 73 whose axes of rotation parallel to each other and parallel to the feed direction (no. 79 in 5 ). From the first roll 71 becomes the film raw material 74 settled. For the film raw material 74 it is a plastic film 75 , which is coated on one side with a pressure-sensitive adhesive. The adhesive is on the first page 80 the plastic film 75 , which the Wälzflächenteil 50 is facing and is covered with a protective film 76 covered. On the second role 72 is the remaining after punching plastic film 75 wound. The first and the second role 71 ; 72 are arranged so that the plastic film 75 at a small distance parallel to the first support surface 52 of Wälzflächenteils 50 over runs. Below the plane passing through the first bearing surface 52 is defined, is the third role 73 arranged on which the protective film 76 is wound up. The present arrangement of the third roll 73 causes the protective film 76 near the first roll 71 in front of the rolling surface part 50 from the plastic film 75 is deducted.

As soon as the Wälzflächenteil 50 in the desired position below the hold-down 77 and the punching tool 80 is located there and stands still, the hold-down 77 moved down, leaving the plastic film 75 on the first contact surface 52 of Wälzflächenteils 50 suppressed. Only in the area of the hold-down 77 comes the pressure-sensitive adhesive of the plastic film 75 with the first contact surface 52 in contact so that it comes to a bonding there. Off the lowhold 77 there remains a small distance between the plastic film 75 and the first contact surface 52 exist, so that it does not come there to a bond.

The hold down 77 has a circular cylindrical peripheral surface, wherein its plastic film 75 facing end face formed flat and perpendicular to the central axis 83 the peripheral surface is aligned. The punching tool 78 surrounds the hold-down 77 sleeve-like with little play, so that's the punching tool 79 in the direction of the central axis 83 opposite the downholder 77 is mobile. The punching tool 78 is in the form of a circular cylindrical tube formed, which has a constant wall thickness. At the plastic film facing end of the punch 78 is an annular cutting edge 82 provided immediately adjacent to the hold-down 77 is arranged. Only shortly after the hold-down the plastic film 75 on the first contact surface 52 pressed, drives the punching tool 78 down and thus punches the spacer by means of the cutting edge 82 from the plastic film 75 out.

Subsequently, the punching tool 78 and the hold-down 77 from the first contact surface 52 lifted. This can be done simultaneously or with a small time offset. The spacer remains on the Wälzflächenteil 50 , where the remaining plastic film 75 moved slightly upwards. Now, the Wälzflächenteil 50 in feed direction (No. 79 in 5 ) are moved so that it can be brought into the correct position for attachment of a further spacer. At the same time, the first, the second and the third role 71 ; 72 ; 73 rotated, so that the plastic film 75 moved by slightly more than the diameter of the spacer.

LIST OF REFERENCE NUMBERS

10

linear bearings

11

longitudinal direction

12

guide rail

13

second rolling surface

14

Mounting surface of the guide rail

20

role

21

third face

22

peripheral surface

30

carriages

31

deflection assembly

32

main body

33

second bearing surface

34

second end face

35

Mounting surface of the carriage

36

threaded hole

37

Return pipe

38

longitudinal seal

39

end seal

50

rolling surface

51

first rolling surface

52

first contact surface

53

first end face

54

Recess in the inlet area

55

Length of Wälzflächenteils

56

first plane of symmetry

57

second plane of symmetry

60

spacer

61

first surface

62

second surface

63

first glue

64

second adhesive

65

clear distance of the spacers

66

Distance between first and second surface

70

contraption

71

first role

72

second role

73

third role

74

film raw material

75

Plastic film with pressure-sensitive adhesive

76

protector

77

Stripper plate

78

punching tool

79

feed direction

80

first side of the plastic film

81

Hole from the punched spacer

82

cutting edge

83

central axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008051682 A1 [0002]
• DE 102008019002 A1 [0004]

Claims (10)

Linear rolling bearings ( 10 ) in a longitudinal direction ( 11 ) extending guide rail ( 12 ) and a carriage ( 30 ), wherein the carriage ( 30 ) a main body ( 32 ) and at least one Wälzflächenteil ( 50 ) with a flat first rolling surface ( 51 ), wherein the first rolling surface ( 51 ) several rollers arranged in a row ( 20 ) in rolling contact with the first rolling surface ( 51 ) and a second rolling surface ( 13 ) on the guide rail ( 12 ), wherein the Wälzflächenteil ( 50 ) opposite the first rolling surface ( 51 ) a flat first bearing surface ( 52 ), characterized in that between the first bearing surface ( 52 ) and the main body ( 32 ) several separate spacers ( 60 ) are provided by plastic, which via a first adhesive ( 63 ) fixed to the first bearing surface ( 52 ) and / or fixed to the main body ( 32 ), the spacers ( 60 ) of a second ( 64 ) from the first ( 63 ) are surrounded by different adhesive, which the first bearing surface ( 52 ) immediately fixed to the main body ( 32 ), wherein the material of the spacers ( 60 ) different from the first and the second adhesive ( 63 ; 64 ) is selected. Linear rolling bearing according to claim 1, characterized in that the spacers ( 60 ) a first planar surface ( 61 ), which of the first bearing surface ( 52 ), with one to the first surface ( 61 ) parallel second surface ( 62 ) is provided, which the main body ( 32 ) is facing. Linear rolling bearing according to claim 2, characterized in that the distance ( 66 ) between the first and second surfaces ( 61 ; 62 ) is between 5 μm and 50 μm. Linear rolling bearing according to claim 2 or 3, characterized in that the outline of the first and the second surface ( 61 ; 62 ) is the same. Linear rolling bearing according to claim 4, characterized in that the outline of the first and the second surface ( 61 ; 62 ) is circular. Linear rolling bearing according to claim 5, characterized in that the diameter of the first and the second surface ( 61 ; 62 ) between 20% and 90% of the width of the rolls ( 20 ) is. Linear rolling bearing according to one of the preceding claims, characterized in that the spacers ( 60 ) consist of polyester. Linear rolling bearing according to one of the preceding claims, characterized in that exactly two spacers ( 60 ) are provided whose clear distance ( 65 ) in the longitudinal direction between 50% and 80% of the length ( 55 ) of the rolling surface part ( 50 ) is. Linear rolling bearing according to one of the preceding claims, characterized in that the first adhesive ( 63 ) is a pressure-sensitive adhesive, preferably an acrylate, wherein the second adhesive ( 64 ) is a thermoset, preferably an epoxy resin. Method for producing a rolling surface part ( 50 ) with spacers ( 60 ) for use in a linear rolling bearing ( 10 ) according to any one of the preceding claims, comprising the steps of: - providing a plastic film ( 75 ), which are on a first page ( 80 ), which of the first surface of the spacer ( 60 ), with a pressure-sensitive adhesive as the first adhesive ( 63 ) is coated; and punching out the spacers ( 60 ) from the plastic film ( 75 ), whereby the spacer ( 60 ) at the same time as the first page ( 80 ) on the first bearing surface ( 52 ) of the rolling surface part ( 50 ) is pressed.

Images